Author:Geldenhuys, CJDate:Jan 1994A hypothesis is developed that environmental factors (rainfall and substrate) determine the potential limits of forest distribution, but that actual forest location pattern is determined by the fire pattern, which in turn is determined by the ...Read more
Author:Maharaj, R; Gayaram, R; Crouch, N; Maharaj, V; Pillay, P; Bhagwandin, N; Folb, PIDate:Feb 2006Malaria is a serious health problem in South Africa affecting the lives of approximately 4 million people. Resistance to the principal vector, Anopheles arabiensis, has initiated a search for new plant-derived insecticides. Plants were selected ...Read more
Author:Lück-Vogel, Melanie; Jongman, RDate:Sep 2008On April 1st, 2008 the EU FP7 project EBONE was launched. The aim of the project is the development of a (cost-effective) biodiversity data collection and monitoring system based on local field data, landscape metrics and remote sensing data ...Read more
Author:Otter, LB; Marufu, L; Scholes, MCDate:Mar 2001Biogenic processes in southern African savannas are estimated to produce 1.0 Tg NO yr(-1), 44.2-87.8 Tg C yr(-1) as non-methane hydrocarbons (NMHCs) and to consume 0.23 Tg CH4 yr(-1). Floodplains and wetlands in southern Africa are estimated ...Read more
Author:Baloyi, MJ; Greben, HADate:May 2006Mine drainage arises from oxidation of pyrites, due to exposure to air and water. Acid mine drainage normally contains high concentrations of sulphate, metals and acidity. These pollutants can be reduced by applying the biological sulphate ...Read more
Author:Krige, PDDate:Aug 2003The purpose of this booklet is to make a contribution towards improving safety standards in underground transportation. Its scope is limited to horizontal track-bound transportation on gold and platinum mines and its emphasis is on learning ...Read more
Author:Engelbrecht, F; Landman, WDate:Aug 2010South Africa's climate is described for each season, and how the climate is affected by topography. Synoptic systems contributing to the variations in weather and climate we observe is also described.Read more
Author:Von Maltitz, Graham P; Scholes, RJDate:Nov 1995Fuel wood harvesting is considered sustainable when consumption is equal to or less than production. An empirical model was developed to estimate potential fuel wood production from savannas. The model is based on the observation that in ...Read more
Author:Wessels, Konrad J; Prince, SD; Malherbe, Johan; Small, J; Frost, PE; Van Zyl, DDate:Jan 2007Advanced Very High Resolution Radiometer (AVHRR), Normalized Difference Vegetation Index data (NDVI, I km (2), 1985-2003) and modelled net primary production (NPP, 8 km (2), 1981-2000) data were used to estimate vegetation production in South ...Read more
Author:Tazvinga, Henerica; Amigun, B; Stafford, William HL; Mapako, MDate:Apr 2011Access to modern energy services is a fundamental prerequisite for property reduction and sustainable human development. Many remote rural South African communities are characterized by low energy demand and low population densities, making ...Read more
Author:Osburn, LDate:Nov 2010Energy modelling can be used in a number of different ways to fulfill different needs, including certification within building regulations or green building rating tools. Energy modelling can also be used in order to try and predict what the ...Read more
Author:Kennedy, DADate:Jan 1991Relationships of speed vs density, volume and percentage loop occupation are investigated. The effect of differing directional splits in traffic volumes is also examined. A method of determining the Level-of Service of two-lane roads in terms ...Read more
Author:Jolliffe, BDate:Aug 2006Slides include: What is the knowledge economy? Drivers; Will it contribute to development? Development as freedom; Knowledge Economy, ICTs, convergence etc; Ducks to put in a row; Patents and knowledge economy; South Africa? Threat to local ...Read more
Author:Strauss, K; Brent, AC; Hietkamp, SDate:May 2006Current Life Cycle Impact Assessment (LCIA) procedures have demonstrated certain limitations in the South African manufacturing industry. The aim of this paper is to propose new characterisation and normalisation factors for classified mined ...Read more
Author:Sanders, PJ; De Beer, Morris; du Plessis, HWDate:26 May 2009Various aspects of the determinations and use of elastic moduli of pavements materials are herein addressed. Included is an investigation into the sensitivity of pavement life to changes in elastic material parameters, an update of moduli ...Read more
Author:Landmann, TDate:Jul 2003Burn severity was quantitatively mapped using a unique linear spectral mixture model to determine sub-pixel abundances of different ashes and combustion completeness measured on the corresponding fire-affected pixels in Landsat data. A new ...Read more
Author:Kruger, FJ; Forsyth, GG; Kruger, LM; Slater, K; Le Maitre, David C; Matshate, JDate:Nov 2006The risk associated with vegetation fires (veldfires) in South Africa is substantial, and veldfires cause severe losses to life, property and the environment in most areas of the country. However, this risk has two parts: first, that arising ...Read more
Author:Marais, R; Van Wilgen, BW; Stevens, DDate:Jan 2004This paper provides estimates of the costs of clearing important species of invasive alien plants, as well as of progress made with clearing, based on data from a recently developed GIS-based project information system. Before the deployment ...Read more
Author:Mambo, Julia; Murambadoro, Miriam DDate:Mar 2018The climate change response policy gives the mandate to all municipalities and other levels of government to develop and implement climate chnage adaptation response. The availability of appropriate information is essential for this process ...Read more